Something I forgot to mention. Is that because you work out exactly the number of ships you have, it is a good idea to name the boats, much like how countries still name their ships, i.e. HMS Victory, Nossa Senhora da Conceicao, l'Ocean. To name but three famous ships. I like to do this because I can then embelish the ships and build into my stories.
Once you have named them you may want to list them in a Naval Unit List, from this you can vary the size proportionally. What do I mean by this proportionate variation? Well everything you worked out in the naval statistics, can be taken at face value or can be taken as an average of the actual ships, but I normally treat my figures used as the general mean average. An example of what I mean by this is the dimensions of the ships. The average wargalley measure 42 x 5 x 2, but some boats could be 50 x 7 x 3 and others 34 x 3 x 2. Now I generally don't vary my navies much, but I like to include some variation to account for flagships and smaller maneuvreable galleys, that would be used to get in and amongst the heavier ships.
This variation does not need to be accounted for in the calculations, it does not change the calculation. This is what I call "Created Variation". You take the mean values and go above and below the value to create some specific variation in the fleet.
This is specifically nice for roleplaying elements because then you can differentiate between the ships and everything you have worked out feasible and correct. Slowly these tutorials shape the parameters of your world,then you can fill in the details.